Determining stress-strain relationship for necking in polymers based on macro deformation behavior

作者：Muhammad S; Jar P Y B^*

来源：Finite Elements in Analysis and Design, 2013, 70-71: 36-43.

DOI：10.1016/j.finel.2013.03.003

• FEM
• Necking
• HDPE
• Creep

An approach, based on mechanical testing and finite element modeling, is presented to establish the stress-strain relationship for polymers when necking evolves under tension. The paper gives details of criteria used for evaluating the stress-strain relationship during the necking process, and depicts how the total strain range is divided into several sections for the ease of the iterative calculation process. High-density polyethylene (HDPE) is used as a sample polymer to illustrate the approach. The results show that this approach can consider non-linear and creep deformation during the neck evolvement, and the stress-strain relationship established can be applied to a finite element model to regenerate force-elongation curve and cross-section reduction measured from the mechanical testing.

• 出版日期2013-9